200 lines
6.8 KiB
C
200 lines
6.8 KiB
C
/* Copyright (C) 1996-2022 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<https://www.gnu.org/licenses/>. */
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#ifndef _NSSWITCH_H
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#define _NSSWITCH_H 1
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/* This is an *internal* header. */
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#include <arpa/nameser.h>
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#include <netinet/in.h>
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#include <nss.h>
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#include <resolv.h>
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#include <search.h>
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#include <dlfcn.h>
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#include <stdbool.h>
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/* Actions performed after lookup finished. */
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typedef enum
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{
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NSS_ACTION_CONTINUE,
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NSS_ACTION_RETURN,
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NSS_ACTION_MERGE
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} lookup_actions;
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struct nss_action;
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typedef struct service_library
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{
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/* Name of service (`files', `dns', `nis', ...). */
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const char *name;
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/* Pointer to the loaded shared library. */
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void *lib_handle;
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/* And the link to the next entry. */
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struct service_library *next;
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} service_library;
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/* For mapping a function name to a function pointer. It is known in
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nsswitch.c:nss_lookup_function that a string pointer for the lookup key
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is the first member. */
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typedef struct
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{
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const char *fct_name;
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void *fct_ptr;
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} known_function;
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/* To access the action based on the status value use this macro. */
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#define nss_next_action(ni, status) nss_action_get (ni, status)
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#ifdef USE_NSCD
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/* Indices into DATABASES in nsswitch.c and __NSS_DATABASE_CUSTOM. */
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enum
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{
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# define DEFINE_DATABASE(arg) NSS_DBSIDX_##arg,
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# include "databases.def"
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# undef DEFINE_DATABASE
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NSS_DBSIDX_max
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};
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/* Flags whether custom rules for database is set. */
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extern bool __nss_database_custom[NSS_DBSIDX_max] attribute_hidden;
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#endif
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/* Warning for NSS functions, which don't require dlopen if glibc
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was built with --enable-static-nss. */
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#ifdef DO_STATIC_NSS
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# define nss_interface_function(name)
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#else
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# define nss_interface_function(name) static_link_warning (name)
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#endif
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/* Interface functions for NSS. */
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/* Put first function with name FCT_NAME for SERVICE in FCTP. The
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position is remembered in NI. The function returns a value < 0 if
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an error occurred or no such function exists. */
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extern int __nss_lookup (struct nss_action **ni, const char *fct_name,
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const char *fct2_name, void **fctp);
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libc_hidden_proto (__nss_lookup)
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/* Determine the next step in the lookup process according to the
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result STATUS of the call to the last function returned by
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`__nss_lookup' or `__nss_next'. NI specifies the last function
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examined. The function return a value > 0 if the process should
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stop with the last result of the last function call to be the
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result of the entire lookup. The returned value is 0 if there is
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another function to use and < 0 if an error occurred.
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If ALL_VALUES is nonzero, the return value will not be > 0 as long as
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there is a possibility the lookup process can ever use following
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services. In other words, only if all four lookup results have
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the action RETURN associated the lookup process stops before the
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natural end. */
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extern int __nss_next2 (struct nss_action **ni, const char *fct_name,
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const char *fct2_name, void **fctp, int status,
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int all_values) attribute_hidden;
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libc_hidden_proto (__nss_next2)
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extern int __nss_next (struct nss_action **ni, const char *fct_name, void **fctp,
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int status, int all_values);
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/* Search for the service described in NI for a function named FCT_NAME
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and return a pointer to this function if successful. */
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extern void *__nss_lookup_function (struct nss_action *ni, const char *fct_name);
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libc_hidden_proto (__nss_lookup_function)
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/* Called by NSCD to disable recursive calls and enable special handling
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when used in nscd. */
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struct traced_file;
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extern void __nss_disable_nscd (void (*) (size_t, struct traced_file *));
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typedef int (*db_lookup_function) (struct nss_action **, const char *, const char *,
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void **);
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typedef enum nss_status (*setent_function) (int);
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typedef enum nss_status (*endent_function) (void);
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typedef enum nss_status (*getent_function) (void *, char *, size_t,
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int *, int *);
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typedef int (*getent_r_function) (void *, char *, size_t,
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void **result, int *);
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extern void __nss_setent (const char *func_name,
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db_lookup_function lookup_fct,
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struct nss_action **nip, struct nss_action **startp,
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struct nss_action **last_nip, int stayon,
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int *stayon_tmp, int res)
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attribute_hidden;
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extern void __nss_endent (const char *func_name,
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db_lookup_function lookup_fct,
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struct nss_action **nip, struct nss_action **startp,
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struct nss_action **last_nip, int res)
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attribute_hidden;
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extern int __nss_getent_r (const char *getent_func_name,
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const char *setent_func_name,
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db_lookup_function lookup_fct,
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struct nss_action **nip, struct nss_action **startp,
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struct nss_action **last_nip, int *stayon_tmp,
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int res,
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void *resbuf, char *buffer, size_t buflen,
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void **result, int *h_errnop)
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attribute_hidden;
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extern void *__nss_getent (getent_r_function func,
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void **resbuf, char **buffer, size_t buflen,
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size_t *buffer_size, int *h_errnop)
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attribute_hidden;
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struct resolv_context;
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struct hostent;
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extern int __nss_hostname_digits_dots_context (struct resolv_context *,
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const char *name,
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struct hostent *resbuf,
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char **buffer,
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size_t *buffer_size,
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size_t buflen,
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struct hostent **result,
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enum nss_status *status, int af,
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int *h_errnop) attribute_hidden;
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extern int __nss_hostname_digits_dots (const char *name,
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struct hostent *resbuf, char **buffer,
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size_t *buffer_size, size_t buflen,
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struct hostent **result,
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enum nss_status *status, int af,
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int *h_errnop);
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libc_hidden_proto (__nss_hostname_digits_dots)
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/* Maximum number of aliases we allow. */
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#define MAX_NR_ALIASES 48
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#define MAX_NR_ADDRS 48
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/* Prototypes for __nss_*_lookup2 functions. */
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#define DEFINE_DATABASE(arg) \
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extern struct nss_action *__nss_##arg##_database attribute_hidden; \
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int __nss_##arg##_lookup2 (struct nss_action **, const char *, \
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const char *, void **); \
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libc_hidden_proto (__nss_##arg##_lookup2)
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#include "databases.def"
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#undef DEFINE_DATABASE
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#include <nss/nss_module.h>
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#include <nss/nss_action.h>
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#include <nss/nss_database.h>
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#endif /* nsswitch.h */
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